Diagnostics

VWM

Vibrating Wire Monitor

Beam transverse profile

and position Beam Halo measurement

Dynamic range

> 1E6

Resolution for

proton beam

3pA

Resolution for

electron beam

70pA

Principle

The VWM is based on the wire resonant frequency dependence on its tension, itself dependent on its temperature. A positive feedback oscillator excites the wire oscillations at this resonant frequency. Particles penetrating the wire heat it, change its tension and therefore its resonant frequency. Vibrating wire sensors have been applied to electron, proton, ion and photon beams. VWM can be used for neutron beams too.